JPS58160062A - Screwing head - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a screw head according to the preamble of claim 1.

This type of screw head is covered by West German Patent No. 2843688.
known by the number. In this case, a screwdriver with a polygonal cross section is mounted in the central receptacle of the pin sleeve, the mounting adapted to its angular dimensions. The head surface of the screwdriver is supported by a thrust bearing ball, and the polygonal surface of the screwdriver is abutted by a ball that passes through a radial hole in the sleeve. This ball is pressed inwardly by the inner wall of the connecting sleeve. The tonic annular spring additionally serves to hold the screwdriver in the inserted position. This annular spring engages in a recess formed in the corner of the screwdriver. Therefore, the ball and the annular spring are the clamping members that fix the screwdriver. A screw head of this construction has the disadvantage that it is difficult to replace the screwdriver. For this reason, the insertion portion of the screwdriver is relatively short, so the grip area is insufficient for grasping it by hand.

Therefore, changing the screwdriver must be carried out, for example, on a bench. Another disadvantage is that in the uncoupled state the polygonal shank of the screwdriver wears strongly at the level of the ball.

This shortens the life of the screwdriver. Furthermore, in the uncoupled state, the installation results in insufficient guidance between the pin sleeve and the coupling sleeve.

The object of the invention is to form a screw head of the above type in such a way that the screwdriver can be replaced easily, has improved guidance and reduced wear, and is simple to manufacture and advantageous in use. It is to be.

This problem is solved by the features recited in claim 1.

This feature increases the usefulness of the screwdriver.

For installation, the pin sleeve does not directly accommodate a screwdriver. This accommodation is carried out by means of a sleeve which is supported in the pin sleeve. Therefore, the screwdriver can be engaged with this sleeve in a complementary manner. Since the ball cooperates with the coupling sleeve, the screwdriver does not suffer any wear in the uncoupled state. The ball acts on the sleeve.

There is the advantage that a central guide is provided in the uncoupled state, which serves to reduce wear on the screwing head. The operating sleeve facilitates the removal of the screwdriver. This operating sleeve performs two functions. On the one hand, the lower free end of the operating sleeve forms an edge surrounding the screwdriver.

When this edge rests on the structural member around the screw, the operating sleeve biases the edge of the coupling sleeve.

This connecting sleeve is attached and uncoupled after a suitable relative displacement with respect to the pin sleeve.

On the other hand, the actuating sleeve can be slid against the action of a spring. In this case, the tightening of the operating sleeve r [to hold the screwdriver releases the member]. In this state,
The screwdriver slides out of its housing in the sleeve. Therefore,
No need to use tools to change screwdrivers.

For example, depending on the operating sleeve, the clamping sleeve with a ball acts as a clamping member.

During this tightening, the ball presses against the polygonal surface of the screwdriver. When displacing the actuating sleeve against the action of the spring, the connecting sleeve and the mounting pin sleeve and the sleeve supported in the pin sleeve rest in their starting position.

To make it possible to exchange the screwdriver, the actuating sleeve is slidable in the screwing direction from its abutment position with the connecting sleeve.

In another preferred embodiment, the mounting is carried out in such a way that the pin sleeve is additionally supported in the connecting sleeve via a ball, which ball is provided on the screwdriver side of the connecting ball and engages in an annular groove in the shank of the sleeve. are doing. The bearing ball thus mounts to support the pin sleeve axially and radially on the sleeve.

In order to be able to easily change the screwing depth, the bottom of the receptacle is provided with a height adjustment screw as a stop for the head of the screwdriver.

In front of the edge of the annular section there is a screw centering ring and/or
It is advantageous if a retaining ring can be attached to the handle. This makes it possible to affix the screw sufficiently firmly to the screw-in head before screwing in, so that mounting and rotation of the screw is achieved solely by the screw-in head.

In a very advantageous holding method, the screw retaining ring is provided with an adhesive magnet, which is mounted on the outside of the screwdriver bore.

In the modification of the screwing head, in order to be able to easily change the screwing depth and to be able to remove the screwdriver without applying additional pulling forces in the screwing direction to the operating sleeve For this purpose, the actuating sleeve and the connecting sleeve are arranged to be movably adjustable relative to each other by means of a screw, the displacement of these two parts exceeding a decoupling position before releasing the holder of the screwdriver.

This feature has the important advantage that the screw depth can be varied without tools.

To change the screw-in depth, it is only necessary to make a full rotation of the actuating sleeve and to displace it appropriately inward or outward of the connecting sleeve. Other measures are unnecessary. This screwdriver head is particularly suitable for drilling presses or similar devices, since no feed forces in the screwing direction are generated when the screwdriver is increased or removed. Even if the screw head is not sufficiently fixedly held by the drilling machine, the screw head will not be pulled out of the holding part when the operating sleeve is displaced. The displacement of the actuating sleeve into the release position takes place in the direction of insertion of the screwdriver and beyond the uncoupling position.

In this case, the holding of the screwdriver is not released in the connection release position.

Self-adjustment is reliably prevented by the fact that a locking nut is attached to the adjusting screw.

Therefore, in order to change the screw-in depth, it is necessary to loosen the stopper, screw in the operating sleeve and tighten the stopper.

In a preferred embodiment, the sleeve for accommodating the screwdriver is surrounded by a retaining bushing for the clamping element, which is formed as a ball, and which is biased by a spring in the screwing direction and projects in the screwing direction. The ball is accommodated in the hollow part of the protruding part, which is held by a sleeve that houses the entire screwdriver, and the second clamping part forming the member is surrounded by a bushing and this clamping part is An operating sleeve is located outside the bushing, the operating sleeve having a shoulder remote from the shoulder of the carrier bushing. Displacement of the mating bushing takes place only when the shoulder of the actuating sleeve biases the shoulder of the mating bushing.

When the screw head reaches the uncoupled position, the actuating sleeve must be displaced further in order to slide the carrying bush.

Furthermore, it is advantageous if the projecting portion coincides with a segment forming the entire non-round cross section of the sleeve, and the clamping surface of the bushing is formed over the entire circumference of the inner surface. Thereby, on the one hand, the projecting part extends the sides of the receiving part, and on the other hand, it prevents the mating bush from rotating on the sleeve. Furthermore, it is easy to assemble.

Hereinafter, two embodiments of the present invention will be described based on FIGS. 1 to 10.

The screw head is provided with a mounting pin 1 which can be attached to the chuck of a drilling machine or similar machine. This attachment continues to the pin sleeve 2. For mounting, the pin sleeve has in its central region three radial holes 5 arranged circumferentially at a constant angle for accommodating the connecting balls 4.
It is equipped with At the end of the pin sleeve 2, three other radial holes 5 are provided for accommodating the bearing balls 6.

Said connecting ball 4 cooperates with an arcuate groove 7 extending in the longitudinal direction. This groove is formed in the shank 8' of the sleeve 8, which is mounted in the pin sleeve 2. Since six arcuate grooves 7 are arranged in the circumferential direction of the sleeve 8 at regular angle intervals, the connecting balls 4 are inserted into every other groove 7, as shown in FIG. On the other hand, the bearing ball 6 is
It engages with the annular groove 9 of the shaft portion 8 of. Therefore, the bearing ball 6 supports the sleeve 8 in the axial and radial directions.

The connecting sleeve 1o supporting the bearing ball 6 is mounted and guided on the bottle sleeve 2. The thicker cross-sectional area 11 of this connecting sleeve presses the connecting ball 4 into the groove 7. This state is maintained by a compression spring j2 supported in the region 11 and provided inside the coupling sleeve 1o. This compression spring is attached to the retaining ring 15 at the upper end of the pin sleeve 2.
is in contact with. The annular shoulder 14 of the connecting sleeve 1o is attached by coming into contact with the collar 15 of the pin sleeve.
Movement of the coupling sleeve in the direction of spring bias is restricted. A concentric escape chamber 16 for the connecting ball 4 is connected to the annular shoulder 14 .

At its lower free end, the sleeve 8 is provided with a polygonal concentric receptacle 17. A correspondingly polygonal screwdriver shank 18' is inserted into this receptacle. The blade part of the screwdriver is the blade part for a Philips screw.

According to a first embodiment, the insertion depth of the screwdriver 18 can be varied by means of a height adjustment screw 20. This height adjustment screw is screwed into the bottom of the receptacle 17 and rests against the head 18 of the screwdriver.

For tightening, the bush 21 is guided longitudinally on the sleeve 8. The tightening facing radially inward is bush 21.
One end of a compression spring 23 is supported by the upper collar 22 . The other end of the compression spring rests on an outwardly facing shoulder 24 of the sleeve. Therefore, the tightening is done by bushing 2.
1 is energized upward. When the screwdriver 18 is not attached, the movement of the tightening bushing is restricted by the retaining ring 25 of the sleeve 8. As shown in Figure 2.3,
The slanted clamping surface 26 of the bushing 21 is provided in the radial bore 27 of the sleeve 8, forcing the ball 28 inwardly. This tightening causes the ball to press against the polygonal surface of the screwdriver and holds it in the receptacle 17.

For tightening, an operating sleeve 29 is guided between the bush 21 and the connecting sleeve 10.

This operating sleeve is located at A of the end wall 10' of the connecting sleeve 10.
il. Operation sleeve 2
The inner end of 9 is entirely formed with a collar 50# that covers the collar 22 of the bushing 21. In the basic condition shown in FIG. 2, the collar 50'' rests flat on the collar 22.

On the other hand, the end wall 10' of the connecting sleeve 10 is located in front of the step 50 formed by the annular portion 50.

The lower free end of the annular portion 50 forms an edge Ri surrounding the screwdriver 18. A screw alignment retaining ring 51 is mounted in front of this edge. To secure this retaining ring, an annular spring '
An inner annular groove 32 for accommodating 53 is useful. Annular spring C [engages with the outer groove 54 of the screw retaining ring 31 and fixes this fv ring. The retaining ring 31 carries a 35 gold adhering magnet in a concave portion on its end face side. The adhesive magnet is provided with a hollow portion 35' which accommodates the screw head 19'.

This hollow part is connected to a through hole 36 for a screwdriver 18. This through hole coincides with the opening 37 of the retaining ring 51. Edge R resting on the structural member into which the screw is screwed
extends forward because the retaining ring 51 is formed as described above. Therefore, the end surface of the screw retaining ring 31 forms a mounting edge R'7.

As can be seen from FIG. 2, the collar 30 of the operating sleeve 29
A free space 38 is formed between the lower end of the sleeve 2 and the tightening pin sleeve 2.
allows relative displacement of the connecting sleeve 10 and the operating sleeve 29 relative to each other.

When screwing in the screw 19, the screw is fixed to the blade 18 of the screwdriver 18 by means of the attachment magnet 55. During screwing, forces are transferred from the mounting pin sleeve 2 to the sleeve 8. In this case, a screwdriver 18 for turning the screw is carried by the sleeve 8. When the appropriate screw-in depth is reached, the edge R' rests on the structural member and, with further screw-in, the mounting is such that the pin sleeve 2, together with the sleeve 8, is connected to the operating sleeve 29, the connecting sleeve 1° and the screw retaining ring 31. to perform relative displacement. In this case, the connecting ball 4 enters the escape chamber 16 of the connecting sleeve 1°, so that it is pushed outward by the sides of the arcuate groove 7. This is indicated in FIGS. 3 and 5 by dash-dotted lines. The sleeve 8 is therefore no longer carried along with the screwdriver 18. This indicates to the user that screwing has been achieved.

The compression spring 12, which is compressed during the relative displacement, relaxes after removing the screw head and returns the coupling sleeve 10 together with the operating sleeve 29 to the starting position shown in FIGS. 1 and 2.

When replacing the screwdriver 18, the operating sleeve 29 is moved in the screwing direction X by grasping the knurled annular part 30. During the tightening process, the bushing 21 moves together via the collar 30' of the operating sleeve 29. When tightening, the surface 26 of the bush releases the ball 28, so
The screwdriver 18 can be removed. This removal takes place, for example, at the same time as the annular part 31 is pulled. As can be seen from FIG. 4, during this process, the relative position of the connecting sleeve 1o with respect to the pin sleeve 2 and the sleeve 8 remains unchanged.

After loosening the operating sleeve 29, the pre-compressed compression spring 23 tightens the bushing 21 and the operating sleeve 29.
Return to the basic position shown in Figure 2.

The parts of the second embodiment shown in FIGS. 7-10 are numbered the same as in the first embodiment.

The lower free end 8'' of the sleeve 8 is stepped, thereby forming an annular shoulder 4o, on which one end of a compression spring 23 is supported. The end is a carrying bush 42 displaceable on the sleeve 8.
It is supported on an annular shoulder 41 of. An annular shoulder 41 connects the two different guide surfaces of the carrying bush 42 to one another. The free end 42' of the stepped mating bushing 42 has a complete projection 43 projecting in the screwing direction.

The projecting portion has a segment-shaped cross section, and its inner flat surface 4' is aligned with the side surface of the receiving portion 17, which has a hexagonal cross section, as shown in FIG. To make this possible, the end 8# of the sleeve 8 is provided with a corresponding recess 44. The cross-section of the protrusion 45 thus forms a circle with the cross-section of the end 8 located at the same height. The length of the recessed portion 44 is longer than that of the protruding portion 43.

A hollow space 45 is formed in the projecting part 45, which is arranged transversely to the longitudinal direction of the carrier bushing 42 and for accommodating a clamping ball 46. The diameter of the ball 46 is larger than the radial thickness of the protrusion 43. The tightening ball 46 is prevented from falling out of the hollow part 45 by the support edge 47. However, when tightening, the ball 46 has sufficient play in the radial direction.

The free end 8'' of the sleeve 8 and the protruding portion 10 are surrounded by a fastening bush 48.

The bushing is press-fitted onto the outer periphery of the sleeve end 8'. In this case, the protruding portion 43 is not held by this force fit and can move freely.

The fastening bush 48 forms an inner fastening bush 49 that slopes like a wedge toward the free end. This clamping surface cooperates with the clamping ball 46. The tightening surface 49 continues into the hollow part 50 via a step. This hollow fits into the outer circumferential surface of the stepped end 4 of the carrier bushing 42 and allows the carrier bushing 42 to slide.

If the screwdriver 18 is inserted into the receptacle 17, the compression spring 23 displaces the carrying bush 42 in a direction opposite to the direction of insertion of the screwdriver. As a result, the protruding portion 45 is displaced downward together with the ball 46 due to its tightening. In this case, the clamping ball 46 rests on the clamping surface 49, thereby acting on the shank 18 of the screwdriver 18, as shown in FIGS. When a tensile force is applied to the screwdriver 18, the tightening force increases.

The connecting sleeve 10, which is tightened up to the bushing 48, is fully internally threaded at its free end. The male thread of the operating sleeve 29' is screwed into this female thread. The operating sleeve is rotatably mounted on a carrying bush 42 and a clamping bush 48. The free end of the operating sleeve 29 forms a protruding annular portion 60 with a knurl. The lower free end of this annular portion forms an edge Ri surrounding the screwdriver 18. A locking nut 54 is screwed into the external thread of the operating sleeve 29''. After setting the desired screw-in depth, the locking nut 54 is tightened towards the end F of the connecting sleeve 10. Thereby: The relative position of the operating sleeve 29 with respect to the coupling sleeve 10 may change unexpectedly.

By means of the mutual bushing 420 and the stepped end 42',
A shoulder portion 53 is formed. In the basic state shown in FIG. 7, this shoulder it is separated from the shoulder 52 of the operating bush 29'.

When screwing in the screw 19, force is transmitted from the pin sleeve 2 to the sleeve 8 while carrying the screwdriver 18.

When a suitable screw-in depth is reached, the edge R rests on the structural member 51 shown in dashed lines. Then, when screwed in the summer, the pin sleeve 2 is tightened together with the sleeve 8, and the operating sleeve 2
9' and relative to the connecting sleeve 10. In this case, the connecting ball 4 is connected to the escape chamber 16 of the connecting sleeve 10.
Reach within. As shown in FIG. 9, the connecting ball is then manipulated outwardly by the sides of the arcuate groove 7. Thereafter, the sleeve 8 together with the screwdriver 18 is no longer carried. This informs the user that the screw-in depth has been reached.

The compression spring, which is compressed during relative displacement, relaxes after the screw head has been moved away from the structural element 51 and returns the coupling sleeve 10 together with the operating sleeve 29 to the starting position shown in FIG.

When replacing the screwdriver 18, use the operating sleeve 29.
'Then, together with the connecting sleeve 10, move it beyond the disconnected position in the direction of the arrow. At this time, the shoulder 5 of the operating sleeve 29'
2 hits the shoulder 55 of the carrying piece 7 42, and
Slide it to the position shown in Figure 0. The compression spring 23 is compressed by the carrier bush 42, and the ball 46 is tightened by the protruding part 4.
Taken away by 3. Therefore, the clamping ball is out of position when the clamping ring 48 is clamped between the surface 49 and the shank 4.degree. 18'. This allows the screwdriver 18 to be easily removed.

After releasing the actuating sleeve 29', the compression spring 12 returns the coupling sleeve 10 to its abutting position, and the compression spring 25
The supporting bracket 1 is moved until the shoulder 55 of the carrier bushing 42 abuts the end wall 48' of the clamping bushing 48.

When the screwdriver is fully withdrawn, the actuating sleeve 29' is moved in the insertion direction of the screwdriver, so that there is no danger of the screw head being pulled out of the holder of a drilling press or similar device.

The end face of the locking nut 54 on the side of the annular filter 0 forms the end wall 10' of the connecting sleeve 10.

Adjustment of the operating sleeve 29' in one direction is therefore limited.

All novel features described above and shown in the figures are essential to the invention, even if they are not described in the claims.

[Brief explanation of the drawing]

FIG. 1 is an enlarged view of the screw head according to the first embodiment, FIG. 2 is a vertical cross-sectional view showing the screw head in the starting state, and FIG. 3 is a vertical cross-section showing the screw head in the disconnected state. Figure 4 is a partial vertical sectional view of the screw head with the operating sleeve displaced in the screwing direction, Figure 5 is a cross sectional view of the screw head cut at the height of the connecting ball, and Figure 6 is the bearing 7, a cross-sectional view through the screw head at the level of the ball; FIG. 7; an enlarged longitudinal section in the starting state of the screw head according to the second embodiment of the invention, accommodating a screwdriver; FIG. The figure is a cross-sectional view along the ■-■ line in Figure 7,
FIG. 7 is a view similar to FIG. 7 of the screwdriver head in the uncoupled state; FIG. 10 is a longitudinal section through the screwdriver head in which the operating sleeve has been changed beyond the uncoupled position in order to release the screwdriver; It is. 4 Symbols in figure
42...Mounting with pin sleeve 44...Connecting ball
46...Ball 5
8... Sleeve 58... 0 shank 59... Annular groove 10... Connection sleeve 10... Edge portion 17... Receiving portion 18... Screwdriver 18... Head surface 20... Height adjustment screws 21, 28.46.48...Tighten with member 29.2
9...Operating sleeve 30...Annular portion 51...Retaining ring 55...Adhering magnet 7...Through hole 2...Carrying bush 3...Protruding portion 5...Hollow portion 9... ...Tighten at surface 0...Keep nut 2...Shoulder 3...Shoulder

Claims (1)

[Claims] 1. When a certain screwing depth is reached, the edge surrounding the screwdriver rests on the structural member into which the screw is to be screwed, and the screwing head is attached by connecting the bottle sleeve and the screwdriver. The tightening, which is released by sliding the coupling sleeve longitudinally against the action of a spring and whose screwdriver is oriented laterally, is a fixed piece held in a central receptacle for exchange by a member. In a screwing head with a device for automatic uncoupling of the screwdriver when the screwing depth is reached, the central receptacle (17) is connected to the sleeve (8).
This sleeve is installed in a pin sleeve (
The operating sleeve (29, 29) is supported in relation to the sleeve (2), and the mounting accommodates the cross section of the screwdriver in a complementary manner so that the connection with the pin sleeve can be released.
8) and located in front of the end edge (t o') of the connecting sleeve (10) <50) k
the lower free end of this annular part forms a rim (R)', in which the actuating sleeve (29, 29'') is slidable against the force of the spring, and in this sliding position the actuating sleeve (29, 29'') Screw-in head, characterized in that the sleeve is screwed into the screwdriver 18 [- the tightening for holding releases the member (21° 28 or 46.48). 2. The operating sleeve (29) is attached to the connecting sleeve (10). The screw-in head according to claim 1, characterized in that it is slidable in the screw-in direction (X) from the abutting position. is supported in a connecting sleeve (10), and this ball 16
) is provided on the screwdriver side of the connecting ball (4) and engages with the annular groove (9) of the shaft (8') of the sleeve (8). The screw-in head according to item 1. 4. The bottom surface of the accommodating portion (17) serves as a height adjustment screw (20) as a stopper for the head surface (18) of the screwdriver (18).
Patent de characterized in that it is equipped with k. 5. Screw-in according to claim 1, characterized in that a screw centering ring and/or a retaining ring (6)) can be fitted in front of the edge (R) of the annular part (60). head. 6 The screw retaining ring (31) is equipped with an adhering magnet (35)', and this adhering magnet is attached to the through hole (37) of the screwdriver (18).
6. The screw head according to claim 5, wherein the screw head is mounted on the outside of the screw head. 7. The operating sleeve (29) and the connecting sleeve (10) are provided so that their relative movement can be adjusted by means of a screw.
After the displacement of both parts exceeds the connection release position, use a screwdriver (1
8) The screw head according to claim 1, characterized in that the holding part of 8) is released. 8. Screw-in head according to claim 1, characterized in that the adjusting screw is provided with a locking nut (54). 9 The sleeve (8) that accommodates the screwdriver has a ball (46)
The clamping formed as a hollow part (45) of a protruding part (46) which is surrounded by a retaining push for the component and which is biased by a spring in the screwing direction and projects in the screwing direction. contains a ball (46i), the protruding part of which is held by a sleeve (8) accommodating a screwdriver, and a second clamping part forming a member is surrounded by a pusher (48), which is characterized in that on the outside of the pusher an operating sleeve (29') is located, which operating sleeve is provided with a shoulder (521) remote from the shoulder of the carrying pusher (42) Screw-in head according to paragraph 1. 1 [lL The protruding part (43) coincides with a segment forming a non-round cross section of the sleeve (8), the tightening of the push (48) is a surface (49) 10. The screw head according to claim 9, wherein the screw head is formed over the entire circumference of the inner surface.